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2 years ago

Help me please. I cannot do it.

Mathematics

1 answer:

Elena-2011 [213]2 years ago

3 0

Answer:

1608 cm²

Step-by-step explanation:

To find the surface area of a triangular prism, we add up the area of all sides.

Rectangles:

10 * 30 = 300 cm²

21 * 30 = 630 cm²

17 * 30 = 510 cm²

300 + 630 + 510 = 1440 cm²

Triangles:

8 * 21 = 168 cm²

Both:

1440 + 168 = 1608 cm²

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Translate the sentence into an equation. Twice the sum of a number and 5 equals 8

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A fair dice is rolled 6 times. What is the probability of having no 2 and no 3 among the rolls? Round your answer to three decim

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Answer:

64/729

or 0.088 to 3 decimal places.

Step-by-step explanation:

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The answer is (2/3)^6

= 64/729

or 0.088 to 3 decimal places.

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3 years ago

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3 years ago

The owner of a large car dealership believes that the financial crisis decreased the number of customers visiting her dealership

Shkiper50 [21]

Answer:

$z=\frac{750-800}{\frac{350}{\sqrt{100}}}=-1.429$

Step-by-step explanation:

Data given and notation

$\bar X=750$ represent the sample mean

$\sigma=350$ represent the population standard deviation for the sample

$n=100$ sample size

$\mu_o =800$ represent the value that we want to test

$\alpha$ represent the significance level for the hypothesis test.

t would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the mean is lower than 800, the system of hypothesis would be:

Null hypothesis: $\mu \geq 800$

Alternative hypothesis: $\mu < 800$

If we analyze the size for the sample is > 30 and we know the population deviation so is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

$z=\frac{750-800}{\frac{350}{\sqrt{100}}}=-1.429$

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4 years ago

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3 years ago